Kuryakyn Pop-Up Vented Gas Cap For Harley Features: A slick, original design that is sure to set your bike apart from the rest To operate, place fingers on center of cap, rotate cap 1/4 turn, and the spring loaded center pops-up Turning the center then unscrews the entire assembly After screwing cap back in, push down on the center section and rotate it 1/4 turn to return the center to the flush position